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首页> 外文会议>IUTAM Symposium on Turbulent Mixing and Combustion, Jun 3-6, 2001, Kingston, Ontario, Canada >VISUALIZATION OF THE FUEL STRIPPING MECHANISM FOR WAKE-STABILIZED DIFFUSION FLAMES IN A CROSSFLOW
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VISUALIZATION OF THE FUEL STRIPPING MECHANISM FOR WAKE-STABILIZED DIFFUSION FLAMES IN A CROSSFLOW

机译：横流尾迹稳定扩散火焰的燃料喷射机理可视化

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摘要

Recent publications have shown that diffusion flames stabilized in the wake of a burner tube exhibit combustion inefficiencies (i.e. incomplete combustion) that are sensitive to the crosswind velocity. Although data have shown that the inefficiencies appear to be a result of stripping of unburned fuel from the flame in coherent bursts, a clear picture of this mechanism is lacking. The goal of this paper is to help elucidate the mechanism by which these inefficiencies occur through flow visualization. Jet diffusion flames of natural gas were burned in a low turbulence wind tunnel. The gaseous fuel stream flowed from a 24.7mm diameter open tube that protruded vertically into the 1.2m high and 2.4m wide test section of a wind tunnel. The fuel jet was seeded with fine sili-cone oil droplets that evaporated as they reached the flame and acted as a conditional marker for unburned fuel. Using pulsed laser sheet illumination, Mie scattering from the silicon droplets showed that the unburned fuel was contained in coherent structures related to primary vortex structures in the jet and are acted upon by the mean flow field surrounding the flame and burner tube.
机译：最近的出版物表明，在燃烧器管的尾部稳定的扩散火焰表现出对侧风速度敏感的燃烧效率低下（即不完全燃烧）。尽管数据表明效率低下似乎是由于在连贯的爆发中从火焰中剥离未燃烧的燃料所致，但仍缺乏对该机制的清晰印象。本文的目的是通过流可视化帮助阐明这些低效率发生的机制。天然气的喷射扩散火焰在低湍流风洞中燃烧。气体燃料流从直径为24.7mm的敞口管中流出，该管垂直突出进入风洞的1.2m高和2.4m宽的测试段。燃料喷射器上撒有细的硅油滴，这些油滴在到达火焰时蒸发，并充当未燃烧燃料的条件标记。使用脉冲激光薄板照射，从硅滴的Mie散射表明未燃烧的燃料包含在与射流中主要涡旋结构有关的连贯结构中，并受到围绕火焰和燃烧器管的平均流场的作用。

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